几种三维镧系配位聚合物的合成、结构表征及其性质测定

在水热条件下合成了四个氨三乙酸配合物[Ln(NTA)(H2O)]n(Ln=Sm(III)、Gd(III)、Dy(III)和Er(III);NTA=氨三乙酸),分别标记为1、2、3和4;利用元素分析、红外光谱和X射线单晶衍射等对其进行了结构表征.结果表明,配合物1-4同晶同构,中心原子采取N1O7的配位模式形成扭曲的十二面体几何构型.配合物以菱形四面体Ln8C14O28为基本构筑块,通过O—C—O和氢键形成有序的三维结构.此外,四个配合物均存在镧系收缩效应;配合物1显示出反铁磁性,配合物2对Hg2+有良好的荧光选择性.

Synthesis as well as structural characterization and properties determination of several three-dimensional lanthanide coordination polymers

Four three-dimensional（3D）coordination polymers,i.e.,[Ln（NTA）（H2O）]n（Ln= Sm（III）,Gd（III）,Dy（III）and Er（III）;NTA =nitrilotriacetic acid）,were synthesized under hydrothermal conditions（corresponding as-synthesized products are denoted as 1,2,3 and4,respectively）.The as-synthesized products were characterized by means of elemental analyses,infrared spectrometry and single crystal X-ray diffraction.It has been found that the four coordination polymers are isomorphous and isostructural,and the center atoms in the four coordination polymers adopt eight-coordinated modes with N1O7 donor to construct a distorted triangular dodecahedral configuration.Based on the building block of Ln8C14O28 rhombic tetrahedral units,the four coordination polymers are further assembled into highly ordered 3Darchitecture through O-C-O linkers and hydrogen bonds.Besides,lanthanide contraction effect exists in as-synthesized coordination polymers,while 1 presents antiferromagnetic properties and 2 possesses good selectivity toward Hg2＋ion.